388 AMERICAN HYMENOPTERA. 



space; antennae long and slender; posterior tibiae with outer 

 surface distinctly convex and bearing little or no long hair ; 

 traces of corbiculae very slight or absent ; posterior meta- 

 tarsi bearing no long hair, their outer faces distinctly con- 

 caved and with thin but usually fairly even pubescence. 



Genitalia. — Claspers (figs. 66, 70 and 78) thick and power- 

 ful, appearing rather short ; branches very wide at base and 

 narrowing very rapidly toward the apical portion, as seen from 

 above ; volsella very broad and thick, with long triangular 

 recurved apical projection ; squama usually with a very 

 prominent inner lobe : this lobe usually being elongate in 

 form and widened and rounded at the end and having a notice- 

 able membrane run from it to the base of the volsella. 

 Sagitta with head irregular in form, broad, thin, recurved 

 and usually with a serrate outer margin ; not especially broad 

 and nearly straight. 



Boiiibus (Boiiibus) fervidus F. 



Apis fervida Fabricius, Suppl. Entom. System., 1798, p. 274, n. 43 



and 44. 

 Bombus fervidus Fabricius, Syst. Piez., 1804, p. 352, n. 48. 



Illiger, Magaz. f. Insectenk., V, 1806, p. 172. 

 Harris, Catal. Insects Mass., 1835, p. 70. (Catal.). 

 " Lepeletier, Hist. Nat. Insect. Hymen., I, 1836, p. 470, 



n. 8, 9. 

 " Greene, Ann. Lye. Nat. Hist. New York, VII, 1860, 



p. 171, n. 5, 9. 

 " Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 93, n. 10, 



9 a cf. 

 " Putnam, Proc. Essex Instit., IV, 1864, p. 99 (pars.). 

 Packard, Proc. Essex Instit., IV, 1864, p. 110 (pars.), 

 Riley, Am. Ent. and Bot., II, 1870, p. 303, 9 . 

 " Cresson, Rep. Geogr. and Geol. Explor. and Surv. 



100th Merid., 1875, V, p. 728, n. 131, c?. 

 " Putnam, Proc. Davenp. Acad. Nat. Sci., I, 1876, p. 



189. 

 " Cresson, Proc. Davenp. Acad. Nat. Sci., I, 1876, p. 



210. 

 " Cresson, Trans. Amer. Ent. Soc, VII, p. 230. 



(Catal.). 

 " dorsalis Cresson, Trans. Amer. Ent. Soc, VII, 1879, 

 p. 230. (Catal.). 



